Critical NULL Pointer Dereference Vulnerability in Linux Kernel Package
Summary
DEBIAN-CVE-2024-56689: In the Linux kernel, the following vulnerability has been resolved: PCI: endpoint: epf-mhi: Avoid NULL dereference if DT lacks 'mmio' If platform_get_resource_byname() fails and returns NULL because DT lacks an 'mmio' pr... Affects linux versions < 6.12.3-1. Fixed in 6.12.3-1. How to fix ↓
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Background
The Linux kernel is the core component of the Linux operating system, responsible for managing hardware resources and providing essential services to applications. It is widely used across various platforms, including servers, desktops, and embedded systems. The kernel's functionality includes process management, memory management, device drivers, and system calls. This vulnerability specifically affects the PCI endpoint management within the kernel, which is crucial for handling peripheral devices efficiently.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the PCI endpoint management, specifically in the epf-mhi driver. The issue arises when the function platform_get_resource_byname() fails due to the absence of an 'mmio' property in the device tree (DT). This failure leads to a NULL pointer dereference when the code attempts to access res->start, resulting in a potential system crash or instability. The vulnerability highlights the importance of proper error handling in device driver code to prevent such critical failures.
How To Fix
Minimum fixed version
6.12.3-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. It is recommended to apply the patch as soon as it is available to mitigate the risk.
Conclusion
The identified NULL pointer dereference vulnerability in the Linux kernel's PCI endpoint management poses a significant risk to system stability. Users are urged to update to the patched version 6.12.3-1 to mitigate this risk. Regular monitoring and timely updates are essential for maintaining system security.
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FAQ
The vulnerability is a NULL pointer dereference in the Linux kernel's PCI endpoint management, which can lead to system crashes.
The vulnerability affects all versions prior to the fixed version 6.12.3-1 in Debian 13 and Debian 14.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without any signup.
While there are no specific workarounds, it is crucial to plan for an update as soon as possible to avoid potential system instability.
If exploited, this vulnerability can lead to a system crash, causing downtime and potential data loss.
References
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